It's 1989. Mark Davis is a teenager in the Chicago suburbs, where he lands his first job at a local Kmart. He works the sales floor. He makes friends. They share some good times. He loves it.

Davis is also a technical guy—he's into sound systems and wants to know how his particular Kmart is pumping background music through the store. One day in November, he takes a peek around the service desk. He notices a cassette tape marked "October." The tape, he would soon realize, provided the previous month's in-store soundtrack, playing daily for 12 to 14 hours straight.

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There's no resisting. Davis slips the tape into his apron. He returns the next month for another tape. And then the month after. And the month after that. When Kmart starts changing tapes every seven days, week after week, for roughly the next five years, Davis keeps taking them. "Instead of throwing them out, I just put them in my apron and took them home," he explains in a YouTube video, nearly 25 years later.

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Realizing his collection was the makings of pure Internet fodder, Davis converted those many cassette tapes into digital files. The trove can be found here. If you hit play below, you'll be swept back to Kmart circa October 1989.